Customized version of http://www.thingiverse.com/thing:308109

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=308109

Using the following options:

layer_height = 0.06
shape = 0
boarder_thick = 3
boarder_width = 3
image_file = keychain-customizable-lithopane-mark1-420140702-13595-174ewhf-0.dat
ring_hole = 4.5
number_of_layers = 12
tag_size = 40